/Engine/Source/Editor/PropertyEditor/Public/IDetailsView.h
Registers a customization that will be used only if this details panel contains multiple top level objects. I.E it was created with bAllowMultipleTopLevelObjects = true. This interface will be used to customize the header for each top level object in the details panel
void SetRootObjectCustomizationInstance ( [TSharedPtr](API\Runtime\Core\Templates\TSharedPtr)< [IDetailRootObjectCustomization](API\Editor\PropertyEditor\IDetailRootObjectCustomization) > InRootObjectCustomization )